8.2.2. Generating a Logo

Select <Toolbox> → Xtns → Script-Fu → Logos → "Bovination..."
Press the button next to "Font:" and select a nice scalable font.
Press OK.
And you have a full-fledged logo.

The source code of this script can be seen in /usr/share/gimp/2.0/scripts/bovinated-logo.scm. (where /usr is your GIMP installation directory.)
You can play with the other scripts in the Xtns → Script-Fu → Logos menu and view their source code. (My personal favourite is Frosty, which may take quite a while to render on a slow computer.)